Three platforms at the station, which was closed last summer during £800 million improvement works, had limited access, causing delays and cancellations.

It happened hours before MPs were due to hear evidence on rail infrastructure during a Transport Select Committee hearing.

The Rail, Maritime and Transport union said it must tackle ‘underfunding’ of maintenance, renewals and upgrades.

Three platforms had limited access to passengers as services suffered (Picture: PA)

General secretary Mick Cash said: ‘The backlog of maintenance works on Britain’s railways means that passengers are paying a heavy price for years of under-investment as our creaking rail infrastructure is stretched to the limit.

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‘On top of that, safety-critical renewals budgets are under attack, leaving crucial works, and the workforce that delivers them, on a constant knife-edge.

‘That stop-start approach at a time of surging rail demand has to end and we need long-term planning and stability free from the kind of risks we have seen from the Carillion collapse.